Ductile Fracture in Plane Stress

Ductile Fracture in Plane Stress
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平面应力下的延性断裂

DOI:
10.1115/1.4052106
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发表时间:
2022
期刊:
Journal of Applied Mechanics
影响因子:
--
通讯作者:
Benzerga, Ahmed Amine
Benzerga, Ahmed Amine
中科院分区:
--
文献类型:
--
作者:
Torki, Mohammad;Benzerga, Ahmed Amine

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发展了一种基于细观力学的韧性断裂起裂理论,并将其应用于平面应力下韧性断裂的高通量评估。一个关键的概念是,不均匀屈服,使微观破坏发生在带的驱动力是带分辨的正常和剪切力的组合。新准则与唯象Mohr-Coulomb模型相似,但断裂起裂对第三应力不变量的敏感性是新准则的一个重要结果。对平面应力下断裂轨迹的显著特征进行了参数化分析。特别是,它表明,有限的剪切延性不能合理化的基础上,从第一原理出发的各向同性理论。因此,各向同性配方补充各向异性模型占空隙旋转和形状变化,完成预测的断裂轨迹,并与实验比较。从文献中的实验数据进行了广泛的探讨,并概述了一个简单的程序校准的理论。与实验的比较进行了详细讨论。
A micromechanics-based ductile fracture initiation theory is developed and applied for high-throughput assessment of ductile failure in plane stress. A key concept is that of inhomogeneous yielding such that microscopic failure occurs in bands with the driving force being a combination of band-resolved normal and shear tractions. The new criterion is similar to the phenomenological Mohr–Coulomb model, but the sensitivity of fracture initiation to the third stress invariant constitutes an emergent outcome of the formulation. Salient features of a fracture locus in plane stress are parametrically analyzed. In particular, it is shown that a finite shear ductility cannot be rationalized based on an isotropic theory that proceeds from first principles. Thus, the isotropic formulation is supplemented with an anisotropic model accounting for void rotation and shape change to complete the prediction of a fracture locus and compare with experiments. A wide body of experimental data from the literature is explored, and a simple procedure for calibrating the theory is outlined. Comparisons with experiments are discussed in some detail.
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